RU2266625C2 - Method and device for recording and reproducing video data and data carrier, on which video data are recorded using said method and device - Google Patents

Abstract

FIELD: technology for recording and reproducing video data, and also hypertext data.

SUBSTANCE: prior to recording on data carrier, video data, primarily encoded by main method, are decoded and information about video data properties is extracted, decoded video data are encoded by method, different from original method and video transformation information is produced, which should be used for displaying video data in original state on basis of information about properties, and generated video transformation information is recorded together with recoded video data on data carrier.

EFFECT: correct reproduction of video data and data with hypertext, even if video data were repeatedly encoded by different method and recorded.

9 cl, 18 dwg

Description

Technical field

The present invention relates to a method for recording and reproducing video data, and more particularly, to a method for recording and reproducing video data and hypertext data.

State of the art

Video data and hypertext data are multiplexed into a broadcast digital signal. Video data and hypertext data are transmitted in the form of a transport (TP) MPEG stream. The user receives and records the MPEG TP stream onto the information storage medium and can play the MPEG TP stream when he / she wants to see it.

17 is a diagram for explaining a problem of the prior art. Referring to FIG. 17, video data (a) and hypertext data (b) are decoded and generated separately, so that the MPEG MP stream is reproduced as shown together (c). However, when the video data (a) of the MPEG stream is decoded and recorded video data (a '), re-encoded in another way, the video data (a') and hypertext data (b) are not formed and displayed correctly during playback.

SUMMARY OF THE INVENTION

In order to solve the above problems, an object of the present invention is to provide a method and apparatus for correctly reproducing video data and hypertext data, even if the video data has been re-encoded in another way and recorded, and an information storage medium for recording such data.

In order to solve the aforementioned object of the present invention, in one embodiment, there is provided a method of recording video data on an information storage medium. This method includes the steps of (a) decoding video data; (b) encoding the decoded video data in a manner different from the original; (c) generating video conversion information that should be used to decode the video data to its original state; and (d) recording the generated video conversion information and the re-encoded video data.

In another embodiment, a method of recording video data on an information storage medium is provided. The method includes the steps of: (a) extracting video data from a bitstream containing video data and hypertext data, and decoding the video data; (b) encoding the decoded video data in a manner different from the original; (c) generating video conversion information that should be used to decode the re-encoded video data to its original state; and (d) multiplexing the generated video conversion information, the re-encoded video data and the hypertext data into a bit stream; and (e) recording the multiplexed bit stream on an information storage medium.

In yet another embodiment, a method for recording video data on an information storage medium is provided. The method includes the steps of (a) extracting the video data from the bitstream into which the video data and hypertext data are multiplexed, and decoding the video data; (b) encoding the decoded video data in a manner different from the original; (c) generating video conversion information that should be used to decode the video data to its original state; (d) recording the generated video conversion information in the navigation data area of the information storage medium; (e) multiplexing into the bit stream the re-encoded video data and hypertext data to be reproduced together with the video data; and (f) recording a multiplexed bit stream in the program area of the information storage medium.

In order to solve the problem of the present invention, there is also provided an information storage medium that includes video data that has been encoded in a manner different from the original, and video conversion information that should be used to decode the video data to its original state.

Preferably, the information storage medium further includes audio data reproduced together with the video data, hypertext data displayed together with the video data, and program configuration data necessary for reproducing the video data.

Preferably, video data, audio data and video conversion information are multiplexed and recorded in the program area, or video data, audio data and hypertext data are multiplexed and recorded in the program area, and video conversion information is recorded in the navigation data area as program configuration data.

More preferably, the video data, audio data and hypertext data are multiplexed and recorded in the program area in the form of a transport stream format proposed by the expert group on cinematography (MPEG), and video conversion information is recorded in the navigation data area as configuration information of the program structure table (TSP).

Preferably, the video conversion information has been embedded in the video element descriptor as a video conversion descriptor, and the video conversion descriptor has horizontal resolution, vertical resolution and compression ratio as parameters.

A device is also provided for receiving and recording a bit stream to an information storage medium. The device includes a filter for extracting video data from an input bitstream; a recording unit for decoding the extracted video data, re-encoding the decoded video data in a manner different from the original, recording the encoded video data and recording video conversion information that should be used to decode the video data to its original state; and a controller for generating and providing output of video conversion information to the recording unit.

Preferably, the recording unit records video conversion information in the program area together with the re-encoded video data, or records video conversion information in the navigation data area.

The filter includes a demultiplexer for demultiplexing the input bitstream into video data, audio data, hypertext data and program information data. The controller includes a video conversion information generator for generating and outputting video conversion information, which should be used to decode the video data to its original state. The recording unit includes a video decoder for decoding video data received from the demultiplexer, a video encoder for re-encoding the decoded video data, and a multiplexer for multiplexing the generated video conversion information and the re-encoded video data.

Preferably, the controller includes a filter for extracting the TSP packet from the program information data from the output of the demultiplexer, and a generator for generating TSP configuration information containing video conversion information based on the extracted TSP packet. The recording unit records the configuration information of the DSP in the navigation data area.

In order to solve the problem of the present invention, in one embodiment, there is provided a method for reproducing video data from an information storage medium on which video data that has been encoded in a manner different from the original is recorded, and video conversion information that should be used to decode the video data to the original state. The method includes the steps of (a) reading video data and hypertext data from a program area; (b) reading the video conversion information from the navigation data area; and (c) multiplexing the video data, the hypertext data and the video conversion information, and outputting the multiplexing result.

In another embodiment, there is provided a method of reproducing video data from an information storage medium on which video data that has been encoded in a manner different from the original is recorded, and video conversion information that should be used to decode the video data to its original state. The method includes the steps of: (a) reading a bit stream from the program area into which video data, hypertext data and video conversion information have been multiplexed; (b) demultiplexing the bitstream into video data, hypertext data and video conversion information; (c) decoding the video data using the video conversion information; (d) decoding the hypertext data; and (e) mixing the decoded video data and the decoded data with hypertext and outputting the result of the mixing.

In order to solve the problem of the invention, in one embodiment, there is provided a device for reproducing video data from an information storage medium on which video data that has been encoded in a manner different from the original is recorded, and video conversion information that should be used to decode the video data to the original state. The device includes a reading unit for reading from the program area video data and hypertext data that have been recorded in the form of a bit stream, and reading from the navigation data area program information containing video conversion information; a video conversion information extraction unit for extracting video conversion information from program information data and a multiplexer for repeatedly multiplexing video data and hypertext data that are transmitted from the reading unit and video conversion information transmitted from the video conversion information extraction unit and outputting the multiplexing result.

The device further includes a demultiplexer for demultiplexing the bitstream into video and hypertext data; a video decoder for decoding, using the extracted video conversion information, the video data received from the demultiplexer; hypertext data decoder for decoding hypertext data received from the demultiplexer; and a mixing unit for mixing the decoded hypertext data and the decoded video data and outputting the mixing result.

Preferably, the reader reads an MPEG transport stream into which video, audio, and hypertext data have been multiplexed. Preferably, the video conversion information extraction unit generates a TSP packet containing the video conversion information as the TSP configuration information. Preferably, the multiplexer re-multiplexes the MPEG transport stream and the TSP packet and outputs the multiplexing result.

In another embodiment, there is provided an apparatus for reproducing video data from an information storage medium on which video data that has been encoded in a different manner from the original is recorded, and video conversion information that should be used to decode the video data to its original state. The device includes a reading unit for reading from the program area a bit stream into which video data, hypertext data and video conversion information have been multiplexed; a demultiplexer for demultiplexing the read bit stream into video data, hypertext data and video conversion information; an analyzer for extracting video conversion information; a video decoder for decoding, using the extracted video conversion information, the video data received from the demultiplexer; hypertext data decoder for decoding hypertext data received from the demultiplexer; and a mixing unit for mixing the decoded hypertext data and the decoded video data and outputting the mixing result.

Brief Description of the Drawings

The above objectives and advantages of the present invention will become more apparent upon a detailed description of preferred embodiments thereof with reference to the attached drawings, in which:

Figure 1 is a structural diagram of a recording device according to a first embodiment of the present invention;

2 is a block diagram of a recording apparatus according to a second embodiment of the present invention:

Figures 3 and 4 are a diagram for explaining a transport (TP) MPEG stream;

5 is a diagram of a data structure on an information storage medium on which a MPEG MP stream is recorded by a recorder according to the present invention;

6A and 6B are diagrams of data structures of video conversion information that is recorded according to embodiments of the present invention;

7 is a diagram of a structure of navigation data according to an embodiment of the present invention;

FIG. 8 is a data structure diagram of video conversion information according to an embodiment of the present invention; FIG.

9 is a flowchart of a recording method according to a first embodiment of the present invention;

10 is a flowchart of a recording method according to a second embodiment of the present invention;

11 is a structural diagram of a reproducing apparatus according to a first embodiment of the present invention;

12 is a block diagram of a reproducing apparatus according to a second embodiment of the present invention;

13 is a structural diagram of a reproducing apparatus according to a third embodiment of the present invention;

Fig. 14 is a flowchart of a reproducing method according to a first embodiment of the present invention;

FIG. 15 is a flowchart of a reproducing method according to a second embodiment of the present invention; FIG.

16 is a flowchart of a reproducing method according to a third embodiment of the present invention, and

17 is a diagram for explaining a problem of the prior art.

DETAILED DESCRIPTION OF THE INVENTION

1 is a block diagram of a recording apparatus according to a first embodiment of the present invention. As shown in FIG. 1, the recording device includes a filter 1, a controller 2, and a recording unit 3.

Filter 1 extracts the video data from the input bitstream. The recording unit 3 decodes the extracted video data, encodes the decoded video data in a manner different from the original method, and writes the encoded video data to an information storage medium, i.e. disk 100. The controller 2 generates and transmits to the recording unit 3 video conversion information, which should be used to decode the video data to its original state.

For example, when the bitstream is a digital broadcast stream transmitted by a digital television broadcasting station, filter 1 filters information packets containing program information for playback and recording. In addition, filter 1 filters the data packets of the selected program.

A digital broadcast stream is a sequence of data packets of broadcast software and information packets. The information package is divided into two types. One is a first information packet indicating identifiers of packets in which identifiers of data packets of at least one broadcast program are recorded, and the other is a second information packet indicating identifiers of data packets of a broadcast program. In other words, the identifier of the second information packet is recorded in the first information packet, and the identifiers of the broadcast program data packets are recorded in the second information packet. When many channels are supported, then there are as many second information packets as there are channels. Each information packet may be physically composed of multiple packets.

In the case where the digital broadcast stream is an MPEG transport stream, information packets containing program information data for reproduction and recording are a program table package (TP) and a program structure table (GPS) package. The TP packet is the first information packet, and the TSP packet is the second information packet. A data packet is a video packet, an audio packet and / or a hypertext data packet.

Figure 2 is an embodiment of Figure 1. Turning to FIG. 2, a recording device for receiving a TP MPEG stream and re-encoding it in a manner different from the original includes a demultiplexer (DEMPLE) 50, a video decoder 51, a video encoder 53, a filter 55, a special program information generator (SIP) 56 and multiplexer 57 (MPL). In addition, the recording device may further include an audio decoder 52 and an audio encoder 54.

DEMPL 50 receives the MPEG TP stream and divides it into video data (and audio data), hypertext data, and program information data. More specifically, the MPEG TP stream is divided into a Packed Element (PUE) video stream, audio PUE and hypertext data and program information data and are input to a video decoder 51, an audio decoder 52, and a filter 55, respectively. Video decoder 51 decodes the video PUE, and video encoder 53 encodes the decoded video PUE in another way. Encoding in another way encompasses a method of compressing, decreasing or increasing the size of data, etc. The audio decoder 52 decodes the audio PUE, and the audio encoder 54 encodes the decoded audio PUE in another way. When there is no audio decoder 52 and audio encoder 54, the audio PUE is directly input to the MPL 57.

Filter 55 filters the hypertext data and the necessary program information data. More specifically, the filter 55 filters the necessary packets from the TP packets and the TCP packets that are contained in the MPEG MP stream and are periodically transmitted. The program information data necessary for recording, reproducing and searching for a program composed of a MPEG stream TP is recorded in TP packets and TSP packets. The SIP generator 56 generates a SIP describing the program. The SIP data structure is defined in the MPEG system standards. In addition, the SIP generator 56 extracts the vertical and horizontal resolution values and the compression ratio of the video data coming from the video decoder 51, embeds them in the TSP packet as video conversion information, and transmits the resulting TSP packet to MPL 57. The vertical and horizontal resolution values and the compression ratio video data are recorded in the video data header. MPL 57 multiplexes the input video data, audio data, hypertext data and a TSP packet containing video conversion information and provides a multiplexed data stream. The multiplexed data stream is recorded in the program area of the disc 200.

Alternatively, instead of multiplexing the TSP packet with video, audio, and hypertext data, the MPL 57 may transmit the TSP packet as if the TSP packet would be recorded only in the program data area of the disc 200. The TSP packet may be recorded as a TSP in which TSP configuration information is recorded.

3 and 4 are diagrams for explaining the MPEG MP stream. Referring to FIG. 3, video packets 31, 33, 34 and 37 and audio packets 32, 35 and 36 are multiplexed into the input MPEG stream 300 MP. Once TP MPEG stream 300 is received, video packets 31, 33, 34 and 37 and audio packets 32, 35 and 36 are split and re-combined into video stream 302 and audio stream 301.

Referring to FIG. 4, each of the MPEG MP packets 41, 42, 43, 44, 45, 46, and 47 forming the MPEG MP stream 400 is assigned a packet identifier. Similarly, when an MPEG TP stream 400 is received, packets are split during decoding, and packets having the same identifiers are combined into a single file. In other words, as shown in FIG. 4, packets having a packet identifier 1 are combined into a stream 401, and packets having a packet identifier 2 are combined into a stream 402. A package identifier corresponds to a specific packet identifier. In figure 4, the packet has a packet identifier of 0 - package TP. The identifiers of as many TSP packets are recorded in the TP packet as many channels are supported. For simplicity, the TA packet is shown as a single packet, but as described above, the TA packet can be composed of multiple packets.

5 is a diagram for explaining an information storage medium on which an MPEG broadcast program is recorded by a recording apparatus according to the present invention. Turning to FIG. 5, a data recording area of an information storage medium is divided into a navigation data area in which navigation data is recorded and a program area in which programs # 1, # 2, ... #n are recorded. The program is composed of a bit stream into which video data (and audio data) and hypertext data are multiplexed. Each of the programs # 1, # 2, ... #n is a logical block of content recorded on an information storage medium. Navigation data is information necessary for recording, playing back or editing a program and general information described in a program.

6A and 6B are schematic diagrams of data structures of video conversion information that is recorded according to an embodiment of the present invention. Turning to FIG. 6A, a TSP containing TSP configuration information is recorded in the navigation data area. Referring to FIG. 6B, a TSP packet containing the TSP configuration information is embedded in a bit stream and recorded in the program data area.

7 is a diagram of a structure of navigation data according to an embodiment of the present invention. Referring to FIG. 7, navigation data includes a volume control table. The volume control table contains control information for a plurality of programs recorded on the information storage medium. The volume control table includes the general information of the VOL_GI volume about the information storage medium, the program search pointer table PG_SRPT indicating the position of the program information, and the program information table PG_IT # for each program.

VOL_GI contains the number of all programs recorded on the information storage medium, PG_Ns. PG_SRPT indicates the offset value of the corresponding program information table from the starting position of the volume control table, PG_IT_SRP #. There are as many offset values PG_IT_SRP # as there are programs.

The program information table PG_IT contains information necessary for reproducing the program. The fields constituting the program information table PG_IT will be described sequentially below. PAT_SA is the address of the beginning of the TP and indicates the value of the offset of the TP from the starting position PG_IT. PMT_SA is the start address of the GPS and indicates the offset value of the PMT from the initial position PG_IT. TMAP_SA is the starting address of the time table (TV) and indicates the offset value of the corresponding TP from the start position of PG_IT. TP has the same structure as the structure of the program table defined in the MPEG-2 standard. TP can be changed and have a structure in which the TSP information is recorded in the TSP package only for a predefined program that can be used when it is recorded. The TSP configuration information contained in the TSP packet is recorded in the TSP. In addition, the video conversion information according to the present invention is embedded in the TSP. ТМАР - a table that displays the correspondence of time to positions (addresses). The structure of the TMAP may be the same as the structure of the DVD-VR or DVD-Streamer formats.

Video conversion information contains resolution and compression ratio values. Resolution indicates the initial resolution of the video data contained in the bitstream. The compression ratio indicates the compression ratio of the pixel and may indicate the compression ratio of the display screen in case of a request.

Fig. 8 is a data structure diagram of video conversion information according to an embodiment of the present invention. Turning to FIG. 8, video conversion information is embedded in a TSP or a TSP packet. The video element descriptor according to the MPEG specification is defined in the TSP package. The video element descriptor is intended to record, for example, information indicating which of the MPEG-1, MPEG-2, and MPEG-4 specifications correspond to the video data. A video conversion descriptor, which is video conversion information according to the present invention, is added to the video element descriptor. The video conversion descriptor indicates the resolution and compression ratio of the video data before re-encoding. The following is an example of a video conversion descriptor contained in a video element descriptor.

video_transform_descriptor () {
descriptor_tag
descriptor_length
horizontal_size
vertical_size
aspect_ratio_information
}

Here, descriptor_tag denotes the identifier of the video conversion descriptor, descriptor_length indicates the size of the data of the video descriptor, horizontal_size indicates the horizontal resolution, vertical_size indicates the vertical resolution, and aspect_ratio_information denotes the compression ratio.

The MPT packet according to the MPEG specification is defined as follows.

TS_program_map_section () {
table_id
section_syntax_indicator
.
.
.
For (i = 0; i <N; i ++) {
desciriptor ()
}
For (i = 0; i <N1; i ++) {
stream_type
reserved
elementary_PID
reserved
ES_info_length
for (i = 0; l <N2; l ++) {
descriptor ();
}
}
CRC_32
}

Here, "stream_type == 0x02" refers to video data. In other words, when "stream_type == 0x02", "descriptor ()" is a video element descriptor describing the video data. The video conversion descriptor according to the present invention is embedded in the video element descriptor as follows.

TS_program_map_section () {
table_id
section_syntax_indicator
.
.
.
For (i = 0; i <N; i ++) {
desciriptor ()
}
For (i = 0; i <N1; i ++) {
stream_type
reserved
elementary_PID
reserved
ES_info_length
for (i = 0; l <N2; l ++) {
descriptor () [
.
.
video_transform_descriptor () {
descriptor_tag

descriptor_length
horizontal_size
vertical_size
aspect_ratio_information
}
.
.
]
}
}
CRC_32
}

The recording method according to the present invention is described based on the above configuration.

9 is a flowchart of a recording method according to a first embodiment of the present invention. Referring to Fig. 9, the recording device generates video conversion information for the received MPEG MP stream, embeds the video conversion information in the TSP as TSP configuration information, and writes the TSP in the navigation data area, which is separated from the area in which the program is recorded in step 901. Here, the device recording can write the configuration information of the TSP in the form of a packet of the TSP instead of the TSP. Although the DSP requires less recording space, the configuration information of the DSP in the DSP must be converted to a TP packet and a TSP packet before being transmitted to the MPEG decoder during playback. When the TP packet and the TSP packet are recorded, the reorganization is not necessary, but the space required for recording the TP packet and the TSP packet is increased. The recording device extracts the TP package of the MPEG program that the user wants to record, encodes the video data of the TP MPEG package in a different way from the original, and writes encoded video data in the program area at step 902. It is not necessary to record the TP package and the TSP packet together with the recorded video data. Any of steps 901 and 902 may be performed before another step. Alternatively, steps 901 and 902 can be performed simultaneously using the time sharing mode.

10 is a flowchart of a recording method according to a second embodiment of the present invention. Referring to FIG. 10, the recorder receives an MPEG TP stream into which video data and hypertext data are multiplexed, and changes the resolution of the video data when they are recorded. In other words, video decoder 51 decodes the video data in step 1001. Video encoder 53 in step 1002 re-encodes the decoded video data having a changed resolution. The filter 55 in step 1003 provides transmission to the MPL 57 data with hypertext, which were demultiplexed from the MPEG MP stream. The CIP generator 56 generates and embeds the video conversion information (video conversion descriptor) in the video element descriptor at step 1004. The MPL 57 multiplexes the encoded video data (and audio data) and hypertext data and outputs the multiplexing result at step 1005. The recording device records the TSP configuration information, which includes video conversion information (video conversion descriptor) embedded in the video element descriptor in the navigation data area at step 1006, and records a multipl ksirovanny bitstream in step 1007 to programs.

11 is a structural diagram of a playback device according to the present invention. Turning to FIG. 11, the reproducing apparatus includes a decoder 5, a video conversion information extraction unit 6, and a reading unit 4. The read unit 4 reads the data bit stream and video conversion information from the disk 300. The video conversion information extraction unit 6 extracts the video conversion information from the data bit stream read by the read unit 4 and provides for its transmission to the decoder 5. Decoder 5 decodes the data bit stream to its original state, using video conversion information.

12 shows an embodiment of the reproducing apparatus of FIG. 11. Referring to FIG. 12, the reproducing apparatus includes a reading unit 4, a DEMPLE 60, a video decoder 61, an audio decoder 62, a filter 65, an SIP analyzer 66, a hypertext data decoder 63, and a mixing unit 64. In this embodiment, the SIP analyzer 66 is provided as a video conversion information extraction unit 6.

The read unit 4 reads a bit stream from a disk 500 used as an information storage medium and outputs a bit stream. Video data (and audio data) and hypertext data were multiplexed into a bit stream. In particular, the video conversion information was multiplexed into a bit stream in the form of a TSP packet according to the present invention. The bitstream is output as a digital signal or is input to DEMPLE 60. DEMPLE 60 demultiplexes the bitstream into video data, audio data, hypertext data and program information data. A filter 65 filters the hypertext data and program information data in order to output only the necessary hypertext data and program information data. The CIP analyzer 66 analyzes the video conversion information from the program information data and transmits the video conversion information to the video decoder 61. The video decoder 61 decodes the video data according to the initial resolution and compression ratio (video conversion information) transmitted from the CIP analyzer 66 and provides the transmission of the decoded video data to the mixing unit 64. The audio decoder 62 decodes the audio data and transmits the decoded audio data to the audio output device. The hypertext data decoder 63 decodes the hypertext data outputted from the filter 65 and provides the transmission of the decoded hypertext data to the mixing unit 64. Mixing unit 64 mixes the video data with the hypertext data and outputs the mixing result.

FIG. 13 shows another embodiment of FIG. 11. Referring to FIG. 13, the reproducing apparatus includes a reading unit 4, a video conversion information extraction unit 6, a “repeated” multiplexer 67 (PVMPL), DEMPL 60, a video decoder 61, an audio decoder 62, a filter 65, an SIP analyzer 66, a hypertext data decoder 63 and mixing unit 64. In particular, in this embodiment, decoder 5 includes an SIP analyzer 66, and a video conversion information extraction unit 6 is provided separately from the SIP analyzer 66. In addition, unlike the playback device of FIG. 12, decoder 5 further includes an MFSS 67.

The reading unit 4 reads the bit stream from the disk 400, which is an information storage medium, and outputs it to the video conversion information extraction unit 6 and / or DEMPLES 60. The video data (and audio data) and hypertext data were multiplexed into the bit stream. In addition, the reading unit 4 reads the video conversion information that has been recorded as the TSP configuration information from the navigation data area and outputs it to the video conversion information extraction unit 6.

The video conversion information extraction unit 6 extracts the video conversion information and provides it for transmission to the PVML 67 and / or video decoder 61. The PVML 67 multiplexes the bit stream and video transformation information and outputs a digital signal. DAMPLE 60 demultiplexes the bitstream into video data, audio data, hypertext data and program information data. The video decoder 61 decodes the video data according to the initial resolution and compression ratio (video conversion information) transmitted from the video conversion information extraction unit 6, and provides the transmission of decoded video data to the mixing unit 64. The audio decoder 62 decodes the audio data and transmits the decoded audio data to the audio output device. The hypertext data decoder 63 decodes the output hypertext data from the filter 65 and provides the transmission of the decoded hypertext data to the mixing unit 64. Mixing unit 64 mixes the video data with the hypertext data and outputs the mixing result. The program information data is processed by the filter 65 and analyzed by the SIP analyzer 66.

The reproducing method according to the present invention will be described based on the above configuration.

14 is a flowchart of a reproducing method according to a first embodiment of the present invention. Referring to FIG. 14, the video conversion information extraction unit 6 transmits to the decoder 5, to the decoder 5, the TSP configuration information corresponding to the program to be reproduced. The TSP configuration information contains video conversion information. The read unit 4 reads the program bit stream at step 1402 and transmits it to the decoder 5 at step 1403. Decoder 5 multiplexes the bit stream and video conversion information into a digital signal.

15 is a flowchart of a reproducing method according to a second embodiment of the present invention. Turning to FIG. 15, the reading unit 4 reads the MPEG TP stream into which the video conversion information was multiplexed as TSP configuration information from the disk 500 and outputs the MPEG MP stream in step 1501. The playback device reads and reproduces the MPEG MP stream containing video data, which were recorded with a modified resolution. In other words, in step 1502, the DEMPLER 60 demultiplexes the MPEG MP stream read from the disc 500 into video data, audio data, hypertext data, and program information data. The filter 65 performs filtering in step 1503 in order to output the necessary hypertext data and program information data, the CIP analyzer 66 in step 1504 analyzes the video conversion descriptor received from the filter 65, and provides the transmission of the analyzed video conversion descriptor to the video decoder 61. The video decoder 61 decodes in step 1505 video data using the video conversion descriptor so that the video data can have the original resolution. The audio decoder 62 in step 1506 decodes the audio data and outputs the decoded audio data to an audio output device (speaker). The hypertext data decoder 63 decodes the hypertext data in step 1507. The mixing unit 64 in step 1508 mixes the decoded video data and the decoded hypertext data and outputs the mixing result to a display device (not shown). Therefore, video data and hypertext data are displayed in the initial state.

Fig. 16 is a flowchart of a reproducing method according to a third embodiment of the present invention. Turning to FIG. 16, the reading unit 4 reads the MPEG TP stream from the program area of the disc 400 and outputs it to the PVML 67 and the DEMPL 60 in step 1601. At step 1602, the reading unit 4 reads the configuration information of the TSP from the navigation data area of the disk 400, and 6, the video conversion information extraction generates a TSP packet based on the TSP configuration information and enables the TSP packet to be transmitted to the PVMPL 67. The PVPL 67 multiplexes the MPEG MP stream and the MPT packet into a digital signal at step 1603. DEMPL 60 at 1604 demultiplexes the MPEG TP stream into video ie, the audio data, hypertext data, and program information data. The filter 65, in step 1605, performs filtering to output the necessary hypertext data and program information data. The video conversion information extracting unit 6, in step 1606, transmits the video conversion information (video conversion descriptor) to the video decoder 61. The video decoder 61 in step 1607 decodes the video data using the video conversion information (video conversion descriptor) so that the video data can have the original resolution. The audio decoder 62 in step 1608 decodes the audio data and outputs the decoded audio data to an audio output device (speaker). The hypertext data decoder 63 decodes the hypertext data in step 1609. The mixing unit 64 in step 1610 mixes the decoded video data and the decoded hypertext data and outputs the mixing result to a display device (not shown). Therefore, video and hypertext data are displayed in their original state.

The above recording and reproducing methods may be embodied as computer programs. The codes and code segments that make up a program can be easily output by a computer programmer. In addition, programs are recorded on computer-readable media. Programs are read and executed by a computer, thereby realizing methods for recording and playing back an MPEG broadcast program. The computer-readable medium may be a magnetic recording medium, an optical recording medium, or a carrier wave medium.

As described above, according to the present invention, the video data and the hypertext data can be correctly reproduced even if the video data has been re-encoded in a manner different from the original.

Claims (17)

1. A method of recording video data on an information storage medium, and this method comprises the following steps: (a) decode the video data and extract from it information on the vertical and horizontal resolution and aspect ratio of the video image, (b) re-encoding the decoded video data in a manner different from the original encoding of the video data, (c) generating video conversion information that needs to be used when decoding the video data to its original state based on the extracted vertical and horizontal resolution information and aspect ratio, and (d) record the re-encoded video data together with the generated video conversion information on an information storage medium. 2. The method according to claim 1, characterized in that step (b) comprises encoding the decoded video data so that the re-encoded video data has a resolution different from the original. 3. A method of recording video data on an information storage medium, the method comprising the following steps: (a) extracting the video data from the bit stream containing the video data and the hypertext data, decoding the video data and extracting information from them about the initial vertical and horizontal resolution and aspect ratio of the video image, (b) re-encoding the decoded video data in a manner different from the original encoding of the video data, (c) generating video conversion information based on the extracted vertical and horizontal resolution information and the aspect ratio of the video image, wherein the video conversion information should be used to decode the re-encoded video data in their original state, and (d) multiplexing the generated video transform information, the re-encoded video data and the hypertext data into a bit stream, and (e) write the multiplexed bit stream on the information storage medium. 4. The method according to claim 3, characterized in that step (b) comprises encoding the decoded video data so that the re-encoded video data has a resolution different from the original. 5. The method according to claim 3, characterized in that the bit stream is a transport stream of the format proposed by the expert group on cinematography (MPEG), and step (d) comprises step (d1) of embedding the video conversion information in the package of the program structure table (TSP) before multiplexing. 6. The method according to claim 3, characterized in that step (d1) comprises introducing a video conversion descriptor into a video element descriptor. 7. The method according to claim 6, characterized in that the video conversion descriptor has, as parameters, horizontal resolution, vertical resolution and aspect ratio. 8. A method of recording video data on an information storage medium, the method comprising the following steps: (a) extracting the video data from the bit stream into which the video data and hypertext data are multiplexed, and decode the video data and extract from them information about the initial vertical and horizontal resolution and aspect ratio of the video image, (b) re-encoding the decoded video data in a manner different from the original encoding of the video data, (c) generating video conversion information, which should be used to decode the re-encoded video data to their original state, based on the extracted information about the original vertical and horizontal resolution and aspect ratio of the video image, (d) recording the generated video conversion information in the navigation data area of the information storage medium, (e) multiplexing the re-encoded video data and hypertext data to be reproduced together with said re-encoded video data during playback in a bit stream and (f) a multiplexed bit stream is recorded in the program area of the information storage medium. 9. The method according to claim 8, characterized in that the bit stream is a transport stream of the format proposed by the expert group on cinematography (MPEG), and step (d) comprises step (d1) of recording video conversion information as configuration information of a program structure table (TSP) ) 10. The method according to claim 9, characterized in that step (d1) comprises embedding a video conversion descriptor in a video element descriptor. 11. The method according to claim 10, characterized in that the video conversion descriptor has, as parameters, horizontal resolution, vertical resolution and aspect ratio. 12. A device for receiving and recording a stream of bits on an information storage medium, and this device contains a filter that receives an input bitstream and extracts video data from it, a recording unit that receives and decodes the extracted video data and re-encodes the decoded video data in a manner different from the original, a controller that generates and provides the transmission of video conversion information, which should be used to decode the re-encoded video data in their original state, to the recording unit, wherein the recording unit further comprises a multiplexer for multiplexing the generated video conversion information and the re-encoded video data into the multiplexed bit stream, the recording unit recording this multiplexed bit stream on the information recording medium. 13. The device according to p. 12, characterized in that the recording unit records the video conversion information in the program area together with the re-encoded video data. 14. The device according to p. 12, characterized in that the recording unit records the video conversion information in the field of navigation data. 15. The device according to 14, characterized in that the filter comprises a demultiplexer that demultiplexes the input bit stream into video data, audio data, hypertext data and program information data, the controller comprises a video conversion information generator that generates and outputs the video conversion information, which should be used to decode the re-encoded video data to its original state, and the recording unit comprises a video decoder that decodes the video data received from the demultiplexer, and a video encoder that re-encodes the decoded video data. 16. The device according to clause 15, wherein the controller contains a filter that extracts a package of the program structure table (TSP) from the program information data output from the demultiplexer, and a generator that generates the TSP configuration information containing video conversion information based on the extracted TSP packet, and the recording unit records the TSP configuration information in the navigation data area. 17. The device according to clause 16, characterized in that the generator generates the configuration information TSP, introducing in the descriptor of the video element descriptor video conversion, which contains the value of the original resolution and the initial aspect ratio of the video data before re-encoding.

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